My initial thought is that you are mixing up the source port and the destination port of the SMPP connection. The destination port is the port number of the SMPP Server, the most used destination port number is 2775 but other port numbers are also possible. The destination port number and destination IP number are determined by your SMPP service provider.
The source port is the port number of the SMPP client, in this case the SMPP Gateway of Diafaan SMS Server. This port number is assigned by Windows and although it can be changed in theory, it is not a good idea to do this because it can have a bad effect on other processes on the computer. Port number 53517 could be the source port number but this should work fine for the connection unless a firewall is blocking it somehow.
The most like cause of the problem is that the connection is blocked by a firewall or by an IP block on the SMPP server. If you send us the configuration file (File-Export-Configuration) and a communication log of the SMPP Server I might be able to tell more but if a firewall is blocking the connection the logs probably won't tell much.
We would like to have some knowledge regarding application source TCP port binding, our SMPP provider waiting connection with source TCP port 2775 but some how Diafaan using source TCP and 53517 we are not getting communication established.
Looking forward to hear for the solution.
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